What can I do when my update package manager throws this to me?
Error authenticating some packages. Continue? It was not possible to authenticate some packages. This may be a transient network problem. You may want to try again later. See below for a list of unauthenticated packages. xserver-xorg-video-savage
EDIT: trying the following commands
sudo apt-get update && sudo apt-get upgrade
[...] Reading package lists... Done W: GPG error: http://ppa.launchpad.net oneiric Release: The following signatures were invalid: BADSIG 0F678A01569113AE Launchpad Caffeine W: GPG error: http://ppa.launchpad.net oneiric Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3B22AB97AF1CDFA9 Reading package lists... Done [...]